{"id":"F2006B05318","name":"AD/P166/25 - Nose Landing Gear Steering Control Flange - Modification","slug":"ad-p166-25-nose-landing-gear-steering-control-flange-modification","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":45762,"registerId":"commonwealth-F2006B05318-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/P166/25 - Nose Landing Gear Steering Control Flange - Modification","content":"---\nmeta-content-style-type: text/css\nmeta-content-type: application/xhtml+xml; charset=utf-8\nmeta-generator: Aspose.Words for .NET 22.10.0\n---\n\n?xml version=\"1.0\" encoding=\"utf-8\" standalone=\"no\"?>\n\nCOMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 105 CIVIL AVIATION SAFETY AUTHORITY\n\nSCHEDULE OF AIRWORTHINESS DIRECTIVES\n\n \n\n![](image.001.png)  Piaggio P166 Series Aeroplanes\n\n \n\nAD/P166/25  Nose Landing Gear Steering Control Flange - Modification\n\nApplicability: As detailed in the requirement document. Document:  1. Piaggio SB P166-35; or\n\n2. RAI AD 63-48/P166-20.\n\n \n\nCompliance: Forthwith.\n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n\n10/63\n","sortOrder":0}],"analysis":{"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a narrow, technical airworthiness directive focused on a specific mechanical component. It has not expanded beyond its original safety purpose. The scope remains precisely targeted at the nose landing gear steering flange modification for Piaggio P166 aircraft, consistent with standard AD format."},"complexity_factors":["Extremely short document — only 8 substantive lines","No defined terms section — relies entirely on external referenced documents","Simple binary compliance path (two acceptable source documents)","No conditional logic, exceptions, or phased compliance periods","Single mechanical modification with immediate effect","No cross-references to other legislation beyond the enabling Civil Aviation Regulations 1998"],"plain_english_summary":"This is an **Airworthiness Directive (AD)** — a mandatory safety order issued by Australia's Civil Aviation Safety Authority (CASA). It requires owners and operators of **Piaggio P166 series aircraft** to modify the nose landing gear steering control flange.\n\n**What it does:**\n- Mandates a specific mechanical modification to prevent potential failures in the nose wheel steering system\n- Requires compliance with either:\n  - Piaggio Service Bulletin P166-35 (the manufacturer's official repair notice), OR\n  - Italian aviation authority directive RAI AD 63-48/P166-20\n\n**Who it affects:**\n- Owners and operators of Piaggio P166 aircraft (twin-engine utility aircraft commonly used for surveillance, transport, and aerial work in Australia)\n- Maintenance organisations servicing these aircraft\n\n**Why it matters:**\n- **Safety critical:** A failed nose wheel steering flange could cause loss of directional control during taxi, takeoff, or landing\n- **Immediate action required:** \"Forthwith\" means operators must comply immediately — no grace period\n- **Mandatory:** Non-compliance grounds the aircraft (it cannot legally fly until the modification is done)\n\nThis AD appears to be a reissue or adoption of a 1963 Italian directive (note the \"10/63\" reference), suggesting this addresses a long-standing design issue with these vintage aircraft."},"flash_summary":{"complexity_score":4,"scope_assessment":{"changed":false,"description":"The AD text provides no indication that it changes or narrows a prior instrument’s scope. It specifies that applicability is set out in the referenced requirement documents and mandates modification 'forthwith' (Applicability: As detailed in the requirement document; Document: Piaggio SB P166-35; or RAI AD 63-48/P166-20; Compliance: Forthwith). There is no language in the supplied text indicating an amendment, extension or reduction of a previously stated scope."},"complexity_factors":["Mandatory action with immediate timing: Compliance is required 'Forthwith', creating operational urgency and reducing scheduling flexibility (Compliance: Forthwith).","Key technical and applicability details are contained in external documents rather than the AD text itself, requiring users to obtain and interpret Piaggio SB P166-35 or RAI AD 63-48/P166-20 (Document: Piaggio SB P166-35; RAI AD 63-48/P166-20; Applicability: As detailed in the requirement document).","Regulatory authority and enforcement are implicit in the AD format and header but the AD text is brief, so implementers must rely on procedural knowledge of how ADs are enforced under the Civil Aviation Regulations (COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 105 CIVIL AVIATION SAFETY AUTHORITY).","Potential operational complexity from arranging parts, certified maintenance, and aircraft downtime, which are not specified in the AD and must be resolved by operators and maintenance providers (inference from mandatory modification requirement).","Limited information in the AD itself about the exact modification steps, affected serial ranges or exemptions increases the need to consult the referenced documents for precise scope and method (Applicability: As detailed in the requirement document; Document list)."],"plain_english_summary":"This Airworthiness Directive mandates an immediate (“forthwith”) modification to the nose landing gear steering control flange on Piaggio P166 series aeroplanes, to be carried out per the specified Piaggio SB or RAI documents. Owners/operators and maintenance organisations of affected aircraft must arrange and fund the work without delay; technical details and exact applicability are in the referenced documents."}},"importantCases":[],"_links":{"self":"/api/acts/ad-p166-25-nose-landing-gear-steering-control-flange-modification","history":"/api/acts/ad-p166-25-nose-landing-gear-steering-control-flange-modification/history","analysis":"/api/acts/ad-p166-25-nose-landing-gear-steering-control-flange-modification/analysis","conflicts":"/api/acts/ad-p166-25-nose-landing-gear-steering-control-flange-modification/conflicts","importantCases":"/api/acts/ad-p166-25-nose-landing-gear-steering-control-flange-modification/important-cases","documents":"/api/acts/ad-p166-25-nose-landing-gear-steering-control-flange-modification/documents"}}